NAS

National

A

Aeronautcs and

Space

Admnstraton

R84AEB570

October 1984

•4/.x

Free-Jet Feasibility Study of a

Thermal Acoustic Shield

Concept for AST/VCE

Application—Dual Stream Nozzles

Comprehensive Data Report

Volume I

Test Nozzles and Acoustic Data

by

B.A.Janardan

J.F.Brausch

A.O.Price

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Contract NAS3-22137

for

National Aeronautics and Space Administra

Lewis Research Center

21000 Brookpark Road

Cleveland, Ohio 44135
1. Report No. 2. Government Accession No. 3. Recipient s Catalog No

4. Title and SuOtitle

Free Jet Feasibility Study of a Thermal Acoustic Shield

Concept for AST/VCE Application - Dual Flow;

Comprehensive Data Report, Volume I and Volume II

5. Report Date

October 1984

6. Performing Organization Coae

7. Autnor(s)

Janardan, B.A., Brausch, J.F. and Price, A.O.

8. Performing Organization Report No.

R84AEB570

10. Work Unit No.

9, Performing Organization Name and Address

General Electric Company

Aircraft Engine Business Group

Cincinnati, Ohio 45215

11. Contract or Grant No.

NAS3-22137

12. Sponsoring Agency Name and Address

13. Type of Report and Period Covered

Data Report

National Aeronautics and Space Administration

Washington, D.C. 20546

14. Sponsoring Agency Code

IS. Supplemontary Notes

Project Manager: J. Goodykoontz, NASA Lewis Research Center, 21000 Brookpark

Road, Cleveland, Ohio 44135

16. Abstract

Acoustic and diagnostic data that were obtained to determine the influence of

selected geometric and aerodynamic flow variables of coannular nozzles with

thermal acoustic shields are summarized in this comprehensive data report.

A total of 136 static and simulated flight acoustic test points were conducted

with 9 scale-model nozzles. The tested nozzles included baseline (unshielded),

180 shielded, and 360 shielded dual flow coannular plug configurations. The

baseline configurations include a high radius ratio unsuppressed coannular plug

nozzle and a coannular plug nozzle and a coannular plug nozzle with a 20-chute

outer stream suppressor. The tests were conducted at nozzle temperatures and

pressures typical of operating conditions of variable cycle engine. Aerodynamic

laser velocimeter measurements were made for four selected plumes. In addition,

static pressure data in the chute base region of the suppressor configurations

were obtained to assess the influence of the shield stream on the suppressor

base drag.

D'

17. Key Word* (Suggested by Authors))

Jet Noise, Thermal Acoustic Shield,

Coannular Nozzle, Suppressor Nozzle,

Variable Cycle Engine

19. Security Claulf. (of this report)

Unclassified

18. Distribution Statement

Unclassified - Unlimited

20. Security Claaslt. (of this page) 21. No. of pages 22, Price'

Unclassified

*For sale by the National Technical Information Service. Springfield. Virginia 22161
TABLE OF CONTENTS

SECTION PAGE

VOLUME I - TEST NOZZLES AND ACOUSTIC DATA

1.0 INTRODUCTION "•

2.0 SCALE MODEL CONFIGURATIONS 3

2.1 Baseline Acoustic Models 16

2.1.1 Unsuppressed Coannular Plug Nozzle; TAS-10 16

| 2.1.2 Coannular Plug Nozzles with 20-Chute Outer-

 17

Stream Mechanical Suppressor; TAS-15

"} 2.2 Thermal Acoustic Shield Nozzle Configurations 20

.

; 2.2.1 Unsuppressed Coannular Plug Nozzle with Thermal 20

-T Acoustic Shields; TAS-11, -2, and -14

,1 2.2.2 Coannular Plug Nozzle with 20-Chute Outer Stream 21

Mechanical Suppressor with Thermal Acoustic Shields;

, TAS-16,-17,-18 and -19

I 2.3 Thermal Acoustic Shield Flow Conditioning Choke Plate 22

System

. 2.4 Treatment Panel Application 28

; 2.5 Annul us Centering Mechanisms 28

2.6 Aerodynamic Instrumentation 28

3.0 AERODYNAMIC CONDITIONS OF ACOUSTIC TEST POINTS

 37

3.1 Definition of Variables 37

•J 3.2 Test Matrices of Unsuppressed Coannular Plug Nozzles 43

3.2.1 Test Matrix for Unsuppressed Baseline Coannular 43

: Plug Nozzle (TAS-10)

3'.2.2 Test Matrices for Unsuppressed Coannular Plug Nozzle 48

with 180° Thermal Acoustic Shield (TAS-11 and -12)

3.2.3 Test Matrix for Unsuppressed Coannular Plug Nozzle 53

with 360° Thermal Acoustic Shield (TAS-14)

tl 3.3 Test Matrices of Suppressed Coannular Plug Nozzles 56

3.3.1 Test Matrix for Suppressed Baseline Coannular Plug 56

fj Nozzle (TAS-15)

" 3.3.2 Test Matrix for Suppressed Coannular Plug Nozzle 56

with 180° Thermal Acoustic Shield (TAS-16,-17 and

; -18)

• ' 3.3.3 Test Matrix for Suppressed Coannular Plug Nozzle with 67

360° Thermal Acoustic Shield (TAS-19)

J iii

PRECEDING PAGE BLANK NOT FILMED
TABLE OF CONTENTS (CONT'D)

 !

SECTION PAGE j

4.0 ACOUSTIC TEST DATA 71 ft

4.1 Description of Acoustic Data Tables 71

4.2 Acoustic Data of Unsuppressed Baseline Coannular Plug 76 B

Nozzles ;

4.2.1 Acoustic Data of Unsuppressed Baseline Coannular 78

Plug Nozzle (TAS-10)

4.2.2 Acoustic Data of Unsuppressed Coannular Plug 142

Nozzle with 180° Thermal Acoustic Shield (TAS-11,

and TAS-12) H

4.2.3 Acoustic Data of Unsuppressed Coannular Plug 244 J

Nozzle with 360° Thermal Acoustic Shield (TAS-14)

4.3 Acoustic Data of Suppressed Coannular Plug Nozzles 284 ;J

4.3.1 Acoustic Data of Suppressed Baseline Coannular 286 .

Plug Nozzle (TAS-15) j

4.3.2 Acoustic Data of Suppressed Coannular Plug Nozzle 323,

with 180° Thermal Acoustic Shield (TAS-16, -17

and -18) ]

4.3.3 Acoustic Data of Suppressed Coannular Plug Nozzle 462

with 360° Thermal Acoustic Shield (TAS-19)

VOLUME II - LASER VELOCIMETER AND SUPPRESSOR BASE PRESSURE DATA

J

5.0 LASER VELOCIMETER TESTS

 4"

j r

5.1 Summary of LV Tests and Aerodynamic Conditions of Test 499 j

Points

5.2 Scope of LV Measurements on the Selected Plumes ^99 i J

5.3 Laser Velocimeter Calibration Data

 506

5.4 Laser Velocimeter Test Data

 509 H

5.4.1 LV Data of Unsuppressed Coannular Plug Nozzle

 515

with 180° Thermal Acoustic Shield (TAS-11)

5.4.2 LV Data of Suppressed Coannular Plug Nozzle 621

with 180° Thermal Acoustic Shield (TAS-16)

IV
TABLE OF CONTENTS (CONCLUDED)

SECTION PAGE

6.0 SUPPRESSOR BASE PRESSURE DATA WITH AND WITHOUT THERMAL 707

ACOUSTIC SHIELD

6.1 Thrust Loss Calculation Procedure 707

6.2 Base Pressure Data and Thrust Loss Coefficients 713

7.0 NOMENCLATURE 725
1.0 INTRODUCTION

This and the companion volume constitute the Comprehensive Data Report

that summarize the data obtained with dual-flow coannular nozzles as a part of

the investigation performed under NASA Contract NAS3-22137 titled, "Free Jet

Feasibility Study of a Thermal Acoustic Shield Concept for AST/VCE Application". Data obtained earlier with single-flow annular nozzles are presented

in a separate data report.* The objective of both of the single and dual-flow

studies of this contract is to develop a technology base for a thermal acoustic

shield (TAS) concept for AST/VCE application. The needed data base has been

obtained by experimental evaluation of a family of unsuppressed and mechanically

suppressed configurations with and without thermal acoustic shields under both

static and simulated flight conditions.

Detailed schematics of the model coannular configurations, tabulations of

aerodynamic test conditions and computer listings of the measured acoustic data

are presented in Volume I. Aerodynamic conditions of the Laser Velocimeter

(LV) tests along with the LV plume data are summarized in Volume II. The base

pressure data measured on the mechanically suppressed coannular configurations,

with and without the thermal acoustic shields, are presented also in Volume II.

The major results of the single and dual flow studies of this contract are

discussed under separate cover in two final technical reports, NASA CR-3758 and

NASA CR- , respectively.

*"Free Jet Feasibility Study of a Thermal Acoustic Shield Concept for AST/VCE

H Application", Comprehensive Data Report, Volumes I and II by Majjigi, R.K.,

U Brausch, J.F., Janardan, B.A., Hoerst, D.J., Price, A.O., and Knott, P.R.,

R82AEB493, July 1982 (NASA CR-168302).
2.0 SCALE MODEL CONFIGURATIONS

Nine configurations were designed and fabricated to meet the objectives

of this dual-flow thermal acoustic shield phase of this program. Four of

these configurations are with an unsuppressed coannular plug nozzle and

five are with a coannular nozzle having a 20-chute outer-stream mechanical

suppressor.

As the three-flow nozzle system (inner, outer and TAS flows) was supplied

from a two-flow facility, the outer flow stream was split and flow-conditioned

through choke plates to provide proper TAS flow parameters. Due to the unique

flow conditioning design, as well as transitioning a full 360° annular flow to

a 180° arc f;ow for the TAS, an a&'odynamic instrumentation package was

designed to aid in diagnosis of the TAS flow development.

The nine (9) nozzle configurations selected are as follows; shown in

schematic Figures 2-1 through 2-6 and in Photo Figures 2.7 through 2.9:

CONFIGURATION DESCRIPTION

TAS-10 Baseline Unsuppressed Coannular Plug Nozzle,

Figure 2.1.

TAS-11 Unsuppressed Coannular Plug Nozzle with 180°

Shield, Vr

s»° = .64, Figures 2.2, 2.7, 2.8

and 2.9.

TAS-12 Unsuppressed Coannular Plug Nozzle with 180°

Shield, Vr^° = .83, Figures 2.2, 2.7 and

2.8.

TAS-14 Unsuppressed Coannular Plug Nozzle with 360°

Shield, Vr

s»° = .83, Figure 2.3.

TAS-15 Unshielded Coannular Plug Nozzle with

20-Chute Outer-Stream Mechanical Suppressor,

Figures 2.4 and 2.9.

PRECEDING PAGE BLANK NOT FILMED
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Figure 2.7. Photo of Unsuppressed Coannular Plug Nozzle With 180° Shield in

Anechoic Test Facility, Configurations TAS-11 and TAS-12.

10
ORIGINAL PAGE fS

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Figure 2.8. Photo of Unsuppressed Coannular Plug Nozzle With 180° Shield in

Anechoic Test Facility, Configurations TAS-11 and TAS-12.

11
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12
CONFIGURATION DESCRIPTION

• TAS-16 Coannular Plug Nozzle with 20-Chute OuterStream Mechanical Suppressor with 180°

Shield, Vr

s»° = .64, Figure 2.5.

TAS-17 Coannular Plug Nozzle with 20-Chute OuterStream Mechanical Suppressor with 180°

Shield,

Vr

s»o = .83, Figure 2.5.

TAS-18 Coannular Plug Nozzle with 20-Chute OuterStream Mechanical Suppressor with 180°

Shield, Vrs,o = .43, Figure 2.5.

TAS-19 Coannular Plug Nozzle with 20-Chute OuterStream Mechanical Suppressor with 360°

Shield, Vrs,o a .33, Figure 2.6.

Tables 2-1 and 2-II present detailed listings of the configurations'

salient geometries parameters; Table 2-1 defining the coannular nozzle

properties and Table 2-II doing likewise for the applied TAS nozzles. Details

of the individual hardware pieces of the assemblies are provided in the design

report*.

The nine (9) configurations are grouped as baseline nozzles (i.e.,

Configurations TAS-10 and -15) and thermal acoustic shield nozzles (i.e.,

Configurations TAS-11, -12, -14, -16, -17, -18 and -19). The test configuration design details are discussed in Sections 2.1 and 2.2 for the two groups,

respectively. Further details of the model system design and methods of TAS

flow conditioning through choke plates are discussed in Section 2.3. A

description of the diagnostic aerodynamic instrumentation package, which has

been designed to measure the impact on flow characteristics of unique features

of the flow conditioning system and thermal shield nozzles, is given in Section

2.4.

*"Model Hardware Design Report for a Thermal Acoustic Shield Concept for AST/

VCE Application - Dual Stream Nozzle Designs" by J.F. Brausch, R84AEB389,

November, 1984.2

13
TABLE 2-1 - COANNULAR NOZZLE GEOMETRIC PARAMETERS

OUTER STREAM

o Unsuppressed/20-Chute

o Throat Height, h°, in.

o Physical Throat Area, A°, in. 2

o D%g. Based on A°, in.

o Hub Radius at Throat, Rh, in.

o Tip Radius at Throat, R^, in.

o Throat Radius Ratio, R?.

o Termination Shape

o Exit Plane Discharge Angle Re

Vert., ^;h, deg.

o Number of Suppressor Elements

o Supr. Elemental Planform Shape

o Suppressor Area Ratio, AR

o Angle Subtended by Each Chute,

^chute*

 de9-

o Angle Subtended by Each Flow Element,

®Flow»

 de9-

o Chute Depth-to-Width Ratio

o Chute Entrance Design Mach Number

INNER STREAM

o Throat Height, h1' , in.

o Pxhys. Throat Area, A1, in.2

o Deq Based on A1*, in. .

o Hub Radius at Throat, Rt , in.

o Tip Radius at Throat, R\ , in.

o Throat Radius Ratio, RJ;

o Termination Shape

o Exit Plane. Discharge Angle Re

Vert., ®fy,, deg.

CONFIGURATION

TAS-10, -11,

-12 & -14

Unsuppr.

.766

23.222

5.438

4.442

5.208

.853

Convg.

0

-

-

-

-

-

-

—

.234

4.644

2.432

3.047

3.273

.931

Convg.

15

TAS-15, -16,

-17, -18 & -19

20-Chute

1.230

19.90

5.03

3.978

5.208

.764

Convg.

0

20

Radial

1.75

7.714

10.286

1.0

0.7

.200

3.99

2.254

3.082

3.275

.941

Convg.

15

14
TABLE 2-II - THERMAL ACOUSTIC SHIELD GEOMETRIC PARAMETERS

o Shield Arc, deg.

o Shield Height, h$, in.

o Hub Radius @ Throat, R^ , in.

o Tip Radius @ Throat, R* , in.

o Radius Ratio @ Throat, R*

o Physical Throat Area, As, in.2

o D£l Based on As, in.

o Shield Hub Flowpath Angle

@ Throat, e£ , deg.

o Shield Tip Flowpath Angle

@ Throat, Q\ , deg.

o Axial Distance, Shield to Primary

Nozzle Exit Plane, X, in.

o Exit Plane Discharge Angle Re

Vent, e^ , deg.

CONFIGURATION

TAS-11 &

-12

180

.968

5.301

6.269

.846

17.664

4.742

2.73

7.73

.711

5.237

TAS-14

360

.504

5.301

5.805

.913

17.664

4.742

2.73

9.22

.753

5.875

TAS-16, -17

& -18

180

.968

5.301

6.269

.846

17.664

4.742

2.73

7.73

1.811

5.237

TAS-19

360

.504

5.301

5.805

.913

17.664

4.742

2.73

9.22

1.853

u 5.875

15
.1

2.1 BASELINE ACOUSTIC NOZZLES j

}

Configurations TAS-10 and -75 are nozzles without a thermal acoustic

shield and are used as baseline cases to be compared with the nozzles with a I

thermal acoustic shield, to evaluate the shield's effectiveness and the

influence of geometric and aero/acoustic variables for different conditions. FJ

The nozzle's outer flow surfaces, are aerodynamically clean such that, when

tested in the open throat free-jet system, the impact of simulated flight f$l

relative to static can also be evaluated.

2.1.1 Unsuppressed Coannular Plug Nozzle; TAS-10 '1

The unshielded unsuppressed coannular plug nozzle (Configu- j

ration TAS-10, Figure 2.1 and Table 2-1) has geometric flow areas of A° =

23.222 in2, A1' = 4.644 in2, and AT = 27.866 in2 for a total area equivalent \ ]

diameter, Deq

T, of 5.957", and a system area ratio, Ay.1'*0, of 0.20. The

nozzle has convergent flowpath terminations and is the baseline to which 

shielded unsuppressed nozzles are compared. The final aerodynamic flowlines , '•*

are a close replication of the baseline coannular nozzle system tested in v

engine size on the YJ101*, including plug angles, relative spacing of J

outer-to-inner exit planes and plug-tip-truncation. As a starting point for

sizing the new hardware system and to assure commonality of TAS hardware, the |

outer nozzles outer-flowpath physical dimensions were set to those of the

existing 20-chute suppressor nozzles (Configuration TAS-15); as it was {

available hardware. Therefore, (1) 180° TAS and (1) 360° TAS were required to "J

be fabricated, interchangeable to unsuppressed and mechanically suppressed >,

coannular systems. J

. j

"j

*"Aerodynamic/Acoustic Performance of YJlOl/Double Bypass VCE with Coannular

Plug Nozzle", NASA CR-159869, January, 1981.

16
2.1.2 Coannular Plug Nozzles with 20-Chute Outer-Stream Mechanical

Suppressor; TAS-15

The 20-chute coannular suppressor (Configuration TAS-15,

Figures 2.4 and 2.10, Table 2.1) was built and tested under Contract

NAS3-21608, then subsequently tested as a single flow turbojet suppressor

within Contract NAS3-22514 and as a dual flow system within Contract

NAS3-23166. Within the last two contracts, it served as baseline for single

and dual flow shock noise studies. The nozzle is a scaled model of a test-bed

engine suppressor that was built for the YJ101 Engine.

The nozzle utilizes 20-chutes of radial exit-plane-planform

and a suppressor area ratio, A^nnulus/AFlow> °f 1-75. Physical flow areas of

A° = 19.90in2 and A1' = 3.99 in2 result in total flow area of 23.89in2, a total

area equivalent diameter of 5.52", and a system area ratio of 0.20.

2.2 Thermal Acoustic Shield Nozzle Configurations

Two shield nozzles, a 180° shield and a 360° shield, were designed

and fabricated into physical hardware. Each was designed to be interchangeable

with the baseline unsuppressed (TAS-10) and the mechanically suppressed

(TAS-15) coannular nozzles, to implement shield Configurations TAS-11, -12,

-14, -16, -17, -18 and -19. As both shield and outer streams are supplied

from the same facility flow source, variations in shield-to-outer stream

velocity ratio, Vr

s»°, were accomplished through physical changes in choke

plate flow conditioning hardware.

As a base point for shield design, the following "takeoff" aero cycle

was selected for the unsuppressed coannular nozzle system:

Pr° = 3.426 Pri = 2.362 Vri«° = 0.6

TT° = 1730°R If1 = 860°R Ari>° = 0.20

V° = 2500ft/s V1' = 1500ft/s

A° = 23.222in

 2 A1

 = 4.644 in

 2

CD° = .98

Ae° = 22.758in

 2

W0 = 14.29pps

17
ORIGINAL PAGE IS

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CONVERGENT NOZZLE

INNER FLOWPATH

Chute Base Pressure

Instrumentation

Figure 2.10. Photo of Coannular Plug Nozzle With 20-Chute Outer-Stream

Mechanical Suppressor, Configuration TAS-15.

18
] The desired shield exit plane aero conditions were selected as:

o Vr

s>o = 0.6, therefore, Vs = 1500ft/s

o TJS = 1760°R; supplied from the same source as the outer

stream

1 o Pr

s = 1.489

o Ws>° = .15, therefore, Ws = 2.14 pps

^

] o The above parameters, therefore, set Aes = 16.251 in2, and,

using a predicted discharge coefficient of Cns = .92, As =

• 17.664 in2 design.

"•,, The 180° and 360° shields are designed for the same exit area, therefore, resulting in shield exit pli.ne thicknesses of .968" and .504",

I respectively. These are in concert with shield thicknesses of .48" and .97",

} tested within the earlier single-flow phase of this contract. For identical

; aero conditions, the two shield designs will carry approximately the same

weight flow through the shield jets.

Photos of the 180° TAS as applied to the unsuppressed coannular

nozzle are per Figures 2.7 and 2.9.

For set-back of the 180° and 360° TAS exit planes relative to the

outer stream of the baseline coannular nozzle, similar distances to those of

the Single Flow TAS designs were maintained, i.e, .71 and .75" for the dual

, flow compared to .75 and .77" for the previous single flow designs.

For 180° and 360° TAS application to the 20-chute, 1.81 and 1.85"

set-backs were used, substantially less than the 3.2" of TAS application to the

32 chute single flow nozzle. The 20-chute is much shallower in cross section

, ; depth at the tip than the 32 chute; .72" relative to 2.0, respectively. The

f" ! design parameter maintained constant, however, was the distance from the TAS

r-i throat plane to the leading edge of the chute cross section at the tip;

\J approximately 1.2" in both designs.

19
2.2.1 Unsuppressed Coannular Plug Nozzle with Thermal Acoustic j

Shields; TAS-11, -12 and -14

Application of the 180° and 360° shields to the baseline

 !

unsuppressed coannular nozzle results in two physical nozzle systems. However, »

as the flow to the outer nozzle and to the TAS system is supplied from a common (j

source, through flow-conditioning choke plates in the TAS stream (see Section

2.3), each test configuration has a "design-point" shield-to-outer stream Hi

velocity ratio, Vr

s»°, to which the upstream flow conditioning hardware is

initially configured. In designing the flow conditioning hardware, sufficient ' j

mechanical flexibility was allowed to tune-in the physical hardware during

calibration testing, to effect the desired design point Vr

s»°. Off-design- -]

point operation was accomplished by setting desired inner and outer stream flow , 1

conditions, while maintaining the same physical TAS stream choke plate

geometry, and validating the resultant shield exit cycle through instrumen- - j

tation measurements.

Subsequent to the initial "takeoff" design point selection,

used for sizing the shield nozzles, the Single Flow TAS test results indicated \

greater noise suppression could be obtained with the shield operating on a J

somewhat lower outer stream velocity. A "derated-takeoff" cycle ...

was, therefore, selected as the prime point around which shield influence would J

be investigated. Excursions to higher and lower cycle points were still

planned. The selected derated-takeoff cycle is as follows: 

Pr° =3.025 Pri =2.056 Vri»° = 0.60 1

TT°,°R = 1630 TjVR = 870 "*

V°,ft/s = 2325 Vi.ft/s = 1395 ;->

WO.pps = 13.4 Wi.pps = 2.5 J

The following TAS configurations, applied to the baseline |J

coannular plug nozzles, were then selected:

0

20
o TAS-11, Unsuppressed Coannular Plug Nozzle with 180°

shield, Vrs,o = .54 (Figure 2.2).

Pr

s = 1.50 Ws,pps = 4.8

TT

S,°R = 1630 . Vrs,o .54

VS,ft/s = 1465 Wrs,o .35

o TAS-12, Unsuppressed Coannular Plug Nozzle with 180°

Shield, Vrs,o = .33 (Figure 2.2).

Pr

s = 2.04 Ws, pps =6.7

TT

S, °R = 1630 Vrs>° .83

VS, ft/s = 1910 Wr

s»° .50

o TAS-14, Unsuppressed Coannular Plug Nozzle with 360°

Shield, Vrs,o = .83 (Figure 2.3).

- Cycle conditions same as for TAS-12.

2.2.2 Coannular Plug Nozzle with 20-Chute Outer Stream Mechanical

Suppressor with Thermal Acoustic Shields, TAS-16, -17, -18

and -19

Application of the same two 180° and 360° shields to the basic

coannular plug nozzle with 20-chute outer-stream mechanical suppressor, and

selection of cycle points, resulted in the following test configurations:

o TAS-16, Coannular Plug Nozzle With 20-Chute Outer-Stream

Mechanical Suppressor With 180° Shield, Vr

s,o = .64 (Figure

2.5):

Pr

s = 1.50 Ws, pps = 4.8

TT

S, °R = 1630 Vrs»° .64

VS, ft/s = 1465 Wrs,o .35

21
o TAS-17, Coannular Plug Nozzle With 20-Chute Outer-Stream

Mechanical Suppressor With 180° Shield, Vrs»o = .83 (Figure

2.5):

Pr

s = 2.04 Ws, pps = 6.7

TT

S, °R = 1630 Vrs»° .83

V

s, ft/s = 1910 Wrs»° .50

o TAS-18, Coannular Plug Nozzle With 20-Chute Outer Stream ""j

Mechanical Suppressor With 180<> Shield, Vr

s»° = .48 (Figure

2.5): . -j

1

Pr

s = 1.235 Ws, pps =3.3

TT

S, °R = 1630 Vrs»° .48 - j

VS, ft/s = 1070 Wr

s»° .25

3

o TAS-19, Coannular Plug Nozzle With 20-Chute Outer Stream

Mechanical Suppressor With 360° Shield, Vr

s»o = .83 (Figure j

2.6): ^

- Cycle conditions same as for TAS-17. J

J

'

As heated flow to both the outer stream of the coannular nozzle and \

to the TAS nozzle is supplied from a common facility source, the facility

supply conditions are controllable only to effect the desired outer stream „>

exit conditions. The TAS stream exit conditions are met through proper J

choke plate flow conditioning. The design of the flow conditioning system,

therefore, is somewhat unique in that, unlike most choke plate systems, no flow y

adjustment is available through independent stream controls. Rather, the flow

conditioning system is designed to balance mass flow rates and pressure drops fl

across the system, such that desired TAS exit plane flow conditions are

obtained to effect design point velocity ratios, Vr

s>°, of approximately 0.48, }

0.64 and 0.83. The flow conditioning system's design was verified and fine-

 ]

tuned by a series of calibration tests. ,

22

 (
As shown schematically in Figure 2.11, a two stage choke plate

system was designed into the hardware structure to condition the TAS flow

stream. Selective application of choke plate covers having varying numbers of

passage holes over the (20) thru-flow windows, allows for flow area variation

through this first stage choke plate. Specifics of the available choke plate

elements for this first stage choke plate are as follows:

1 I ITEM HOLE DIA. NO. OF HOLES NO. OF PLATE THK. HOLE

NO. d. in. PER PLATE PLATES L. in. L/d

16 .257 15 20 .30 1.17

','} 17 .257 12 10 .30 1.17

1 8 -1 0 .3 0

] , 26 .257 10 10 .30 1.17

•

{ 27 .257 8 10 .30 1.17

\

> The second choke plate was set at an axial location approximately

ten hole diameters past choke plate 1, i.e., at approximately 2.7" aft. This

\ choke plate is a full annular ring. To provide the range of flow area

variation calculated as necessary within the preliminary design evaluation,

(2) stage 2 choke plate rings were fabricated having the following specifications:

J ITEM HOLE DIA.

NO. d, in.

19 .295

20 .257

I For adjustment of flow area through these plates, cover plates are

U used to blank off four of the thru-flow holes at a time. For finer adjustment

n of flow area within choke plate 1 or 2, individual holes are covered on both

<Jt upstream and downstream sides by tack welding thin "buttons" of nichrome over

the holes. Symmetry of flow patterns within both choke plates is maintained

NO. OF HOLES

PER PLATE

400

300

PLATE THK.

L, in.

.447

.447

HOLE

L/d

1.52

1.74

23
o

om

vD• oorsp-i oOo

jJJtl

24
LJ

as best possible within the annulus to create uniform flow profiles. Design

of the flow conditioning choke plate system was primarily influenced by

General Electric in-house experience and by SAE Manual* for discharge

coefficient and pressure drop estimations. Within the preliminary design

evaluation phase, exit flow coefficients for the TAS nozzles were computed

from the Streamtube Curvature (STC) inviscid flow field output of the

Stratford and Beavers boundary layer (SABBL) program. Because STC can handle

only axisymmetric or two-dimensional geometries, the 180° TAS nozzle was

treated as an axisymmetrical nozzle. The flow coefficient was then adjusted

for the boundary layer thickness on the sidewalls. The calculations resulted

in the predicted exit flow coefficients for the 360° and 180° TAS nozzles, as

shown in Figure 2.12, and indicate that the 180° nozzle flow coefficient is

about 0.2 percent lower than that of the 360° nozzle. The flow coefficients

were then used to estimate TAS exit plane aerodynamic flow areas, required for

initial designs of choke plate flow areas.

Total pressure losses within the TAS nozzles, outer stream nozzles

and upstream supply ducting were also estimated within the preliminary design

phase as shown in Figure 2.13. Accurate knowledge of the total pressure

losses throughout the system was reqired in order to design the choke plates

for a particular set of shield-to-outer nozzle exit conditions, or to compute

exit conditions for a given set of choke plates. The DUCTLOSS computer program

was used to calculate the skin friction losses in the upstream portion of the

duct ahead of the splitter (see Figure 2.11, Sta. 133.4 to 149.3), in the

outer nozzle duct (Sta. 149.3 to 178.6), and in the 360° shield nozzle (Sta.

158.7 to 177.9). The loss from the start of the splitter to the first choke

plate is assumed small (.1 percent); however, flow separation or spillage

would tend to increase this number.

The 180° shield nozzle loss is made up of a skin friction loss term,

and a loss due to the diversion of the flow from a 360° annulus to the 180°

*"SAE Aerospace Applied Thermodynamics Manual, SAE Committee AC-9 , Aircraft

Environmental Systems, SAE Inc., New York.

25
1.00

.98

.96

"Dexit

.94 —

.92 —

.90

1.0

P ^ 3.03

r

Nozzle

O 360°

D

A

360

180°

1640°R

1380°R

1640°R

180 SHIELD NOZZLE

C

D180 D360

1.2 1.4 1.6

EXIT PRESSURE RATIO

1.8 2.0 2.2

j

j

J

FIGURE 2.12 PREDICTED 180° AND 360° THERMAL ACOUSTIC SHIELD EXIT

FLOW COEFFICIENTS.

26
y

2.4

2.0

1.6

1.2

PERCENT

0.8

0.4

1.0

158.7

133.4 149.3

180 SHIELD NOZZLE

360 SHIELD NOZZLE

WA-B

\

177.9

BI fe///////////77///V/// ) f I } I i / t

178.6

Assumed

1.4 1.8 2.2 2.6

NOZZLE PRESSURE RATIO

3.0 3.4

FIGURE 2.13 PREDICTED DFTAS TOTAL PRESSURE LOSSES IN TAS AND OUTER

NOZZLE DUCTS.

27
nozzle. The total wetted area of the 180° nozzle is about 15 percent less )

than the 360° nozzle, but the Mach number through much of the duct is up

because of the flow constriction. The net result is estimated to be a 20 }

percent increase in skin friction loss relative to the 360° nozzle. '

The additional loss due to the diversion of the flow into the 180° y

section of the nozzle was estimated by treating the diverter or closure plate

as a gate valve. The loss, using this aerodynamic analogy, is about 1.1 '1

percent. Alternate models for this loss were considered and resulted in losses

ranging from 0.6 to 2.0 percent. *"]

2.6 Aerodynamic Instrumentation

An aerodynamic instrumentation package has been defined and applied

to the test configurations. Application is schematically illustrated in Figure

2.14. Level of instrumentation and purpose of application are discussed as

follows:

28

Z A Treatment Panel Application --j

Preliminary estimates of noise levels anticipated from the choke

plate system indicated potential influence on the basic nozzle system's high -j

frequency far field noise. To circumvent this potential problem, acoustic

panels were fabricated and applied to Support Structure. The panel cavities 1

were packed with ASTROQUARTZ MAT STYLE #550 bulk absorber material. Cavity

depth was approximately 0.4" and packing material was compressed to a density \

of 2.0 Ib. per cu. ft. J

2.5 Annulus Centering Mechanisms J

To assure annular concentricity at the throat planes, inner and j

outer stream struts were utilized to span the flows, at positions sufficiently

forward of the throat planes to preclude wake influence in the flow (see '

Figure 10). The inner stream struts are integral part of the support -^

structure, and, with close toleranced manufacturing, set near perfect annular- , %

concentricity at the exit plane. The outer stream utilized centering screws j

over struts to center the outer annulus exit plane. Both sets of struts are ; \

designed for minimum vortex shedding; the design proven by earlier experience. H

0
ORIGINAL PAGE ?S

OF POOR QUALITY

U

n

U

CM

W

o

M

29
o For Choke Plates: j

- (3) Ps taps prior to choke plate 1, instrumentation items 1 \

through 3, for indication of supply pressure within the -'

plenum supplying choke plate. P,

- (4) Ps taps interstage to choke plates 1 and 2, instrumentation

items 4 through 7, for indication of pressure drop across choke r^

plate 1 and of supply pressure within the plenum supplying

choke plate 2. '1

o For the 180° TAS nozzle and the 360° TAS nozzle: -j

- (7) Ps taps along the internal flowpath, instrumentation Items

8 through 14, for monitoring TAS stream static pressure. 

- (3) Single element Pj probes, instrumentation Items 15, 16 and 

17, for monitoring Pj losses at three axial stations within the

TAS flow. |

**,Ji

- (2) Single element Tj probes, instrumentation Items 18 and 19, , ,

for monitoring TAS stream total temperature. Jj

- (3) Static pressure base taps, instrumentation Items 20, 21 and I

22, for monitoring local static pressure near the exit plane lip

of the TAS nozzles, to which the TAS flow expands. \

- (3) Single element static temperature thermocouples, instrumen- , ,

tation Items 23, 24 and 25, imbedded within the metal wall of j

the TAS nozzles, with measuring elements near the skin surface,

to measure metal temperature for an indication of nozzle growth y

rate for exit plane flow area calculation.

o For outer stream exit plane measurements:

- (1) 8-element Pj rake, instrumentation Items 26 (hub) through 33

(tip), applied to measure Pj distribution across the outer

30 stream annulus during calibration testing, as a gauge of Pj loss
I through the core flow system so that, when removed, facility

instrumentation could be used to set test conditions. For rake

application, see Photo Figures 2.15, 2.16 and 2.17. Note that

• of the eight Pj elements on the rake, the first six are within

the core stream annulus; the remaining two are not monitored.

n

o For 180° TAS stream exit plane measurements:

' - (2) 8-element Pj rakes applied to measure Pj distribution across

the TAS flow annulus, to gauge exit plane conditions as effected

i by choke plate geometry and to calibrate the exit plane

conditions so that acoustic testing could be performed with the

\

• ! rakes removed. Rakes were positioned at 9=0° (aft-lookingfwd), instrumentation Items 34 (hub) to 41 (tip), and at 280°,

instrumentation items 42 (hub) to 49 (tip); 6=0° being centerline of the 180° TAS flow, located east (toward microphones) in

5 the facility. See Photo Figures 2.15 and 2.16 for application.

o For 360° TAS stream exit plane measurements:

- (3) 8-element Pj rakes applied for measurements similar to those

for the 180° TAS nozzle. Rakes were positioned at 6 = 90°,

instrumentation items 26 (hub) to 33 (tip); at 210°, instrumentation items 34 (hub) to 41 (tip); and at 330°, instrumentation

i items 42 (hub) to 49 (tip); 6=0° being due north in the

facility. Note that on each of these three rakes, only the

first four Pj elements penetrated the TAS flow and were

monitored for TAS exit plane Py.

o For 20-chute base pressure measurements:

^J - (8) static pressure taps, instrumentation items 50 through 57,

Q

located in the chute base region, used to assess the influence

of the shield stream on the suppressor base pressure and hence

the nozzle thrust coefficient. Details of base pressure instru-

; mentation are provided in Section 6.0.

31
ORIGINAL PAGE IS

OF POOR QUALITY

Baseline Cylindrical

Nozzle

-»

Flgure O2.15 1 S.

Rakes Applie , • „d t too oute Oute:r Stream

of Unsuppressed Co.»m,l.r Kozzle

32
ORIGINA

L PAGE IS

OF POOR QUALITY i1

NH!HCO i— I c

roOo•o<DW

ra9haaincI•Pw0) •P63 0

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33
Instrumentation Items 26 Through 33

Baseline Cylindrical

Nozzle

!

y!

Figure 2.17. P Rake Application to Outer Stream of Unsuppressed

Coannular Plug Nozzle.

34
0

As Indicated earlier, required outer and shield streams of the dual flow

thermal acoustic shield nozzles were obtained from a single facility flow.

Prior to the acoustic tests, a series of calibration tests were conducted

using the above described instrumentation to determine the exact flow

conditions of the individual outer and shield streams from a measured facility

flow with different sets of choke plates.

35
0

3.0 AERODYNAMIC CONDITIONS OF ACOUSTIC TEST POINTS

A total of 136 acoustic test points were conducted with the coannular

con-figurations described in Section 2.0. The distribution of the test

points over unsuppressed and mechanically suppressed coannular test configurations is summarized in Table 3-1. Majority of the test points

simulate an operating line of AST/VCE engines subject to taking into

consideration the facility total temperature limits (a maximum of 1730°R).

The aerodynamic flow conditions corresponding to the acoustic test

points taken on each of the test configurations are tabulated in this

section. The data are tabulatsd in both International System of Units and

in English Units.

3.1 Definition of Variables

The presented variables are defined in Table 3-II. Sample sheets

specifying the variables listed in the tables that summarize the aerodynamic flow conditions are presented in Table 3-III. In addition to the

inner, outer and shield jet parameters, the tabulated data contain the

mixed conditions that are calculated on a mass-averaged basis for velocity

and total temperature. The mass-averaged velocity (Vmix) and the massaveraged total temperature are calculated using the following expressions:

= W°V° + wV + WSV

S

W° + W1 + Ws

°T° + wV1 + WST

S

T

T

 W TT W TT

W° + W1 + Ws

One may note that V also can be referred to as specific thrust since it

is defined as (total thrust/total weight flow) and "Hj!lx also can be

referred to as stagnation specific enthalpy since it is defined as (total

stagnation enthalpy/total weight flow). From the known Vm ix and T?1X

1

 37

other mixed flow parameters have been calculated by using standard

isentropic relations.

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Table 3-II. Definition of Symbols Used in Aerodynamic Data Tables.

Ideal Thrust

Reference Thrust, 22.820N (5130 Ib)

LBM Defined as 10 log

LVM Defined as 10 log

NF PNL Normalization Factor

PNL Perceived Noise Level

P , Ambient Pressure

amb

P Pressure Ratio

RH Relative Humidity

T Dry Bulb Ambient Temperature

TT Total (Stagnation) Temperature

V Nozzle Exhaust Ideal Velocity

V Freejet Velocity

cLC

W Calculated Ideal Weight Flow Rate

Superscripts

i Inner Jet Condition

o Outer Jet Condition

mix Mass Averaged Condition

s Thermal Acoustic Shield Jet Condition

Subscripts

r Ratio

ref Reference

T Total (Stagnation)

39
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The ambient pressure and temperature, along with the relative humidity

in the GE Anechoic Facility at the time of the test, and acoustic data 1

extrapolated to a 731.5m (2400-ft) sideline and scaled to an AST product

size of 0.902m2 (1400 in.2) also are presented in the tables. The selected m

acoustic data correspond to microphone locations of e-j = 50°, 60°, 70°, LJ

90°, 120°, 130° and 140°.

The normalization factor (NF) found in these tables is employed to

normalize the measured perceived noise level (PNL) to a reference thrust

and jet density as follows:

PNLN = Normalized PNL = PNL + NF

Where 1

NF = -10 log (F/Fref)(pm1x/Pambf

, 1

The aerodynamic flow conditions and selected PNL acoustic data of the

test points are presented in Table 3-IV through 3-XII in Subsections 3.2 j

and 3.3.

J

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3.2 Test Matrices of Unsuppressed Coannular Plug Nozzles

A total of 67 acoustic test points was completed on the unsuppressed

coannular plug nozzle with and without thermal acoustic shields. The test

configurations consisted of:

a. the baseline coannular nozzle (TAS-10)

b. the baseline TAS-10 with the 1" thick 180° shield and the choke

plates selected to give VS/V° of 0.64 and 0.83 (TAS-11 and TAS-12)

at a typical takeoff condition

c. the baseline TAS-10 with the 1/2" thick 360° shield (TAS-14) with

the choke plates identical to those of TAS-12 to give VS/V^»0.83.

Figures 3.1 and 3.2 describe the scope of acoustic tests on an engine

operating line in terms of shield to outer stream velocity ratios as a

function of mass averaged velocity, ymix, and outer stream pressure ratio,

3.2.1 Test Matrix for Unsuppressed Baseline Coannular Plug Nozzle

(TAS-10)

Table 3- IV summarizes the test matrix for the baseline

coannular plug nozzle. The distribution of the test points is as follows:

a. Test Points 1001, 1003, 1005, 1007, 1009, 1011, 1021 and

1002, 1004, 1006, 1008, 1010, 1012 and 1022 simulate typical engine

operating conditions under static and simulated flight, respectively. The

aero conditions of these test points have been selected to yield an inner

to outer stream velocity ratio that is in the neighborhood of 0.6.

b. Test Points 1015, 1019, 1009, 1021, 1023, 1025 and 1027

yield variation in P^ (1.75, 1.90, 2.04, 2.28, 2.61, 2.82 and 3.01

respectively) for a fixed P° of 3.02. The objective of these tests is to

determine whether front quadrant noise can be reduced for a given supersonic outer stream by tuning the inner stream such that expansion waves of

one stream cancel the compression waves of the other. 43
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c. Test Points 1013, 1015 and 1017 having subsonic inner

streams are to be compared with 1007, 1021 and 1011 that have supersonic ]

inner streams to determine, if any, the benefit of subsonic inner streams J

on front quadrant shock noise. p»

3.2.2 Test Matrices for Unsuppressed Coannular Plug Nozzle With 180°

Thermal Acoustic Shield (TAS-11 and -12) W

As described in Table 3-1, the unsuppressed coannular plug ' 1

nozzle with the 180° partial thermal acoustic shield was tested at shield -*

to outer stream velocity ratio, vj-fof 0.64* (TAS-11) and 0.83* (TAS-12) to

investigate the sensitivity of Yf'on the acoustic benefit of a thermal

acoustic shield. Tables 3-V and 3-VI summarize the test matrices for

TAS-11 and TAS-12, respectively. The distribution of test points is as , I

follows:

I

a. Test Points 1103 through 1112 and 1133 through 1142 of .

 J

TAS-11 simulate typical engine operating conditions with the shield in

sideline and community orientations, respectively.

b. V m1xof Static Test Points 1103/1133, 1105/1135, 1107/1137, \

1109/1139 and 1111/1141 match reasonably with those of 1001, 1003, 1005,

1007 and 1021 of the unshielded baseline coannular nozzle (TAS-10), j

[J] 1 y •

respectively. Similarly, V of corresponding flight points of TAS-11

and TAS-10 match with one another. j

J

c. Test Points 1203 through 1212 of TAS-12 simulate typical t ,

engine operating conditions with the 180° shield in sideline orientation. J

d. Typical take-off Test Point 1209/1210 of TAS-12 has vVv°=s [I

0.65 and VS/V°:£ 0.83. The inner stream of this test point was modified

during Test Point 1221/1222 to yield vVv8&c Vs/V°fis 0.83 such that the f]

effect of equal shear by the shield and inner streams on the primary outer

stream can be determined. i

48

*These ratios refer to a typical AST/VCE take-off condition only.
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1

3.2.3 Test Matrix for Unsuppressed Coannular Plug Nozzle with 360°

Thermal Acoustic Shield (TAS-14)

Configuration TAS-14 employs a full 360° thermal acoustic

shield of 1/2" thickness on the baseline coannular plug nozzle (TAS-10).

The shield flow area of this configuration is equal to that of the 1" thick

PS 180° partial shield of TAS-11 and TAS-12. This configuration was tested

** with the choke plates identical to those used with TAS-12 so that the

•| shield to outer stream velocity and weight flow ratios of TAS-12 and TAS-14

1 are comparable. A comparison of the acoustic data of these two configurations should indicate the benefit of a partial thick shield over a

1 thinner full shield of equal area.

V,1'

j . The test matrix of this configuration is presented in Table

3-VII . The distribution of the test points is as follows:

' i

- / a. Test Points 1403-1412 simulate typical engine operating

, conditions with a shield to outer stream velocity ratio of 0.83 at take1 off.

I b. Typical take-off Test Point 1409/1410 has vVv°«: 0.65 and

V

s

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i yield vVv°i« VS/V°» 0.83.

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5
3.3 Test Matrices of Suppressed Coannular Plug Nozzles *

1

A total of 69 acoustic test points was completed on the mechanically ^j

suppressed coannular plug nozzle with and without thermal acoustic shields. ^

The test configurations consisted of: H

a. The baseline coannular configuration with the 20-shallow-chute

 fjl

mechanical suppressor in the outer stream (TAS-15).

b. The baseline TAS-15 with the 1" thick 180° shield and the choke

>s selected to give Vs/V°of

at a typical take-off condition.

plates selected to give Vs/V°of 0.64, 0.83 and 0.48 (TAS-16, -17 and -18)

c. The baseline TAS-15 with 1/2" thick 360° shield (TAS-19) with the j

choke plates identical to these of TAS-17 to give VS/V° of 0.83.

Cl

Figures 3.3 and 3.4 describe the scope of acoustic tests on an engine

operating line' in terms of shield to outer stream velocity ratios as a

function of mass averaged velocity, Vmix and outer stream pressure ratio, I

P°

:i

3.3.1 Test Matrix for Suppressed Baseline Coannular Plug Nozzle

(TAS-15) 1

Table 3-VIII summarizes the test matrix for the baseline o

suppressor coannular plug configuration. The test points simulate typical J

engine operating conditions under static and simulated flight.

3.3.2 Test Matrix for Suppressed Coannular Plug Nozzle With 180°

Thermal Acoustic Shield (TAS-16, -17 AND -18) , j

As described in Table 3-1, the suppressed coannular plug nozzle fl

with 180° thermal acoustic shield was tested at shield to outer stream *-*

velocity ratio, Vr',° of 0.64 (TAS-16), 0.83 (TAS-17) and 0.48 (TAS-18) to

•& 0

investigate the sensitivity of Vr'on the acoustic benefit of the thermal

acoustic shield. Tables 3-IX, 3-X and 3-XI summarize the test matrices for

TAS-16, TAS-17 and TAS-18, respectively. The distribution of the test i'

56

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a. Test Points 1603 through 1612 and 1633 through 1642 of

TAS-16 simulate typical engine operating conditions with the shield in

sideline and community orientation, respectively. Test Points 1651, 1639

and 1645 yield variation in Pj. (1.71, 2.28 and 3.03) for a fixed ?° (»

3.04). The objective of these three test points is to determine, if any,

the benefit of subsonic inner stream on front quadrant shock associated

noise.

b. Test Points 1703 through 1712 of TAS-17 simulate typical

engine operating conditions with shield in community orientation. The

typical take-off Test Point 1709/1720 of this configuration has vVv0^

0.64 and Vs/V°s: 0.83. The inner stream of this test point was modified

during Test Point 1721/1722 to yield vVv°« VS/V°^s 0.83 such that the

effect of equal stress by the shield and inner streams on the primary outer

stream can be determined.

c. Test Points 1803 through 1812 of TAS-18 simulate typical

engine operating conditions with shield in community orientation.

3.3.3 Test Matrix for Suppressed Coannular Plug Nozzle With 360°

Thermal Acoustic Shield (TAS-19)

Configuration TAS-19 employs a full 360° thermal acoustic

shield of 1/2" thickness on the suppressor baseline coannular plug nozzle

(TAS-15). The shield flow area of this configuration is equal to that of

the 1" thick 180° partial shield of TAS-16 through TAS-18. This configuration was tested with the choke plates identical to those used with TAS-17

so that the shield to outer stream velocity and weight flow ratios of

TAS-17 and TAS-19 are comparable.

The test matrix of this configuration is presented in Table

3-XII. The distribution of the test points is as follows:

67
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.1

a. Test Points 1903 through 1912 simulate typical engine

1

operating conditions with shield to outer stream velocity ratio of 0.83 at (I

takeoff. 3

b. Typical takeoff Test Point 1909/1910 has vVv°*s0.65 and ff

Y

S

/V°« 0.83. The inner stream was modified for Test Point 1921/1922 to

yield vVv°« VS/Y°*= 0.83.

•1

1

J

J

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fej

70
4.0 ACOUSTIC TEST DATA

j The far-field acoustic data measured with the test nozzles described

in Section 2.0 at each of the test conditions defined in Section 3.0 are

•x

J presented in this section. A brief description of the acoustic tables is

provided in Subsection 4.1. This is followed by the acoustic data tables

1 that are presented under Subsection 4.2.

A summary of the acoustic data acquisition and reduction procedures

I along with a brief description of the General Electric's Anechoic Test

Facility is provided in the comprehensive data report on the single flow

A . thermal acoustic study of this program*.

I 4.1 Description of Acoustic Data Tables

)

; The far-field acoustic data for a given test point are described under

\ three successive tabulations. Sample sheets of these tabulations are provided in Tables 4-1 through 4-III. The scope of each of these tabulations

}

I is summarized below:

: SAMPLE

SHEET SIZE EXTRAPOLATED DISTANCE TYPE OF DATA

Table 4-1 Actual Size 12.2m (40 ft.) Arc Untransformed, but corrected

for background noise and

standard day (15° C and 75%

relative humidity, Shield and

Bass air attenuation model).

*"Free Jet Feasibility Study of a Thermal Acoustic Shield Concept for AST/

VCE Application - Single Flow", Comprehensive Data Report, Volumes I and

II by Majjigi, R.K., Brausch, J.F., Janardan, B.A., Hoerst, D.J.,

Price, A.O. and Knott, P.R., R82AEB493, July 1982.(NAS/\ c *- I&&302.) 71
HUCOIOPMCOCdHo

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SAMPLE

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Table 4-II Actual Model 12.2m (40 ft.) Arc

Table 4-III 0.9032m2 731.5m (2400 ft.)

Sideline

Flight-transformed model

data. Refraction and turbulence corrections applied.

(For static test, points, this

is identical to untransformed, but corrected for

background standard day

data).

Flight-tranformed model data

that is scaled and extrapolated to a typical AST

case.

The far-field acoustic data provided in these tables consist of 1/3-

octave-band sound pressure levels (SPL, Reference 20 N/m2) and overall sound

pressure levels (OASPL) at angles to the inlet of 40° through 160° (in 10°

increments). In addition, the perceived noise level (PNL), the tone corrected

perceived noise level (PNLT) and A-weighted overall sound pressure level (dBA)

have been computed at each of the microphone angles and are presented.

75
4.2 Acoustic Data of Unsuppressed Coannular Plug Nozzles

For easy reference, the scope of acoustic tests with the unsuppressed

coannular configurations sumnarized in Table 3-1 is repeated in Table 4-IV and

the acoustic test points associated with each of the test configurations

identified.

The acoustic data are presented in Subsections 4.2.1 through 4.2.3.

1

1

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N 05/13/8

3 14.128 PAGE 3

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180° Thermal Acoustic Shield (TAS-16, -17, and -18).

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3 19.3355 PAGE 3

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